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Tridacna

[trih-dak-nuh] /trɪˈdæk nə/
noun
1.
a genus of giant clams inhabiting reefs in the South Pacific, attaining a diameter of 4 feet (1.2 meters) or more, and weighing over 500 pounds (227 kg).
Origin
1770-1780
1770-80; < Neo-Latin, noun use of feminine of Latin tridacnus requiring three bites < Greek trídaknos, equivalent to tri- tri- + dákn(ein) to bite + -os adj. suffix
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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